https://scholars.lib.ntu.edu.tw/handle/123456789/625278
標題: | A facile strategy to achieve polyurethane vitrimers from chemical recycling of poly(carbonate) | 作者: | Chen S.-W Yang J.-H Huang Y.-C Chiu F.-C Wu C.-H RU-JONG JENG |
關鍵字: | Chemical recycling; Phenolic carbamate; Polycarbonate waste; Polyurethane vitrimers; Thermoset | 公開日期: | 2022 | 卷: | 11 | 來源出版物: | Chemical Engineering Journal Advances | 摘要: | Polyurethane vitrimers (PUVs) incorporating urethane reversion covalent adaptable networks are usually limited by the use of aliphatic alcohol for carbamate groups, resulting in high activation energy for bond exchange. In this study, PUVs bearing phenolic carbamate were demonstrated to overcome the low reactivity between phenol and isocyanate in the consumption of polymer wastes. First, poly(carbonate) (PC) was converted to a versatile intermediate mixture of hydroxyl N, N’-diphenylene-isopylidenyl biscarbamates (DP-biscarbamates). Unlike previously developed products with linear structures, the incorporation of a crosslinking agent, trimethylol propane with multiple functional groups would generate crosslinked structures in PUVs with improved mechanical properties. Due to the active sites provided by phenolic carbamate-containing DP-biscarbamate, the PUV products exhibit a gradual viscosity drop that follows the Arrhenius equation and corresponds to the feature of vitrimers with dissociative covalent adaptable networks. These products exhibit activation energies below 100 kJ/mol for topology rearrangement, facilitating the reprocessability for compression molding at mild temperatures of 120 °C. Overall, this study provides a new insight into an efficient material recycling process by the utilization of polymer waste. © 2022 |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85129617891&doi=10.1016%2fj.ceja.2022.100316&partnerID=40&md5=3a5a9c0279896c02788db680a9c4ca3b https://scholars.lib.ntu.edu.tw/handle/123456789/625278 |
ISSN: | 26668211 | DOI: | 10.1016/j.ceja.2022.100316 |
顯示於: | 高分子科學與工程學研究所 |
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